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Description:
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Size:
- The diameter of the cover is 18 inches, which refers to the internal opening of the manhole it covers. This size is common for smaller access points, particularly in residential or light industrial areas.
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Material:
- Heavy-duty manhole covers are typically made of materials like cast iron, ductile iron, or composite materials. Cast iron is the traditional material because it is durable and heavy, offering excellent protection. Ductile iron has improved mechanical properties such as greater strength and flexibility.
- Composite materials are a modern alternative and are much lighter but still strong, resistant to corrosion, and often less prone to theft.
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Heavy Lock Mechanism:
- A heavy lock manhole cover features a locking mechanism to secure the cover in place. This is important for:
- Safety: Prevents unauthorized access to underground utilities.
- Security: Helps prevent the cover from being removed or tampered with, ensuring it stays in place even under traffic or environmental stress.
- Theft Prevention: Manhole covers are sometimes stolen for their scrap value, so locking mechanisms deter theft.
- The lock mechanism could be a simple bolt or a more advanced system involving spring locks, key locks, or turn locks.
- A heavy lock manhole cover features a locking mechanism to secure the cover in place. This is important for:
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Weight:
- A heavy-duty cover of this size can weigh between 50 to 100 pounds or more depending on the material, design, and manufacturer. The weight itself contributes to security since it makes removal difficult without tools.
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Load Bearing Capacity:
- These heavy-duty covers are designed to support heavy loads, typically rated in terms of tonnage. A common rating for an 18-inch heavy manhole cover would be for A15 (1.5-ton), B125 (12.5-ton), C250 (25-ton), or D400 (40-ton) load classes depending on its intended use.
- A15: Light pedestrian traffic.
- B125: Pavements and parking areas where passenger vehicles are present.
- C250/D400: Heavy traffic areas, such as roads, highways, or industrial areas.
- These heavy-duty covers are designed to support heavy loads, typically rated in terms of tonnage. A common rating for an 18-inch heavy manhole cover would be for A15 (1.5-ton), B125 (12.5-ton), C250 (25-ton), or D400 (40-ton) load classes depending on its intended use.
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Shape and Design:
- The manhole cover is typically round, as this shape ensures that the cover cannot fall through its opening, a critical safety feature.
- Some manhole covers might have an anti-slip surface, or patterns to improve grip, especially when wet.
- The heavy lock design may also have sealants or gaskets to make the manhole water-tight or gas-tight, preventing the ingress or egress of fluids or gases.
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Uses and Applications:
- This type of manhole cover is widely used in:
- Sewer Systems: Protects the underground sewer networks while providing access for maintenance.
- Utility Chambers: Covers utility points like telecommunications, electrical, or drainage lines.
- Public Infrastructure: Roads, pavements, and sidewalks, where access to underground services is needed.
- Industrial Areas: Covers for underground pipes, tanks, and other infrastructure that requires secure access.
- This type of manhole cover is widely used in:
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Markings and Labels:
- Manhole covers often feature identification such as the name of the utility company or municipal authority, load rating, or other specifications (such as being traffic-rated or watertight).
Maintenance and Durability:
- Corrosion Resistance: Especially if used in wet or chemically aggressive environments, these covers are often coated with anti-corrosion materials or made from corrosion-resistant materials.
- Wear and Tear: Heavy-duty manhole covers are designed to last for decades, but over time, especially in high-traffic areas, they may need to be inspected for wear, and replacement if necessary.
